Kanban view Modes & US estimation fron lightbox

Not meged yet. To do:
- [ ] https://tree.taiga.io/project/taiga/task/1035
- [ ] Bug: https://tree.taiga.io/project/taiga/task/1033
- [ ] Bug: https://tree.taiga.io/project/taiga/task/1034

![image](https://cloud.githubusercontent.com/assets/877218/4303401/de99204c-3e65-11e4-8be5-bb245dd471ba.png)

![image](https://cloud.githubusercontent.com/assets/877218/4303416/065a665e-3e66-11e4-8791-19a868ffe804.png)